One is standalone tracker, which has integrated SkyLabs GPS receiver, nokia screen, rotary for user interaction. It has some limitation regarding incoming messages, due to only 2k SRAM on Arduino UNO. Using Arduino MEGA can eliminate these problem.

Another is very simple TNC modem, which has integrated Bluetooth transmitter and can work with Aprsdroid or with PC using usb-serial without need to re-program.

Placed sketchbooks and modified LibAPRS version on github if somebody will be interested, no schematics, only code:

I tried bluetooth_tnc and it decodes and sends to aprsdroid fine, no problems at all. But, no tx! When i use micromodem firmware, there is Tx. The only thing is that I need to put somewhere code to control dorji module...No way with pre-compiled hex, so I thought to use this sketch.. Any clues?

I have started work on exapnding a MicroDigi firmware for sending beacons.There has been no activity either here or in the repository. Is this even still acctual?Has anyone used this firmware "out in the wild" ?

]]>http://unsigned.io/forum/profile.php?id=62016-06-10T04:38:59Zhttp://unsigned.io/forum/viewtopic.php?id=2&action=newThat is way cool!!!]]>http://unsigned.io/forum/profile.php?id=1402016-03-14T07:59:54Zhttp://unsigned.io/forum/viewtopic.php?id=149&action=newThanks a lot KJ4HDR for this post! This is a great reference for anyone who wants to set up MicroModem with the native linux drivers! Good job!]]>http://unsigned.io/forum/profile.php?id=22016-02-25T11:39:05Zhttp://unsigned.io/forum/viewtopic.php?id=148&action=newThank You very much!So, let's see if I got this right 1. De-emphasis on Baofeng sets 2200Hz level lower than of 1200Hz tone level ?2. I should be using RC highpass filter ONLY, so that 1200Hz tone level is closer to 2200Hz tone level?3. When using RC highpass filter, I should connect audio output from radio to both capacitor and resistor, and than draw signal from both sides of resistor to connect to modems input (to capacitor and volt divider) ?4. Also, there is no need to ground resistor in RC highpass filter scheme?EDIT: Ok, nevermind, I figured it out Indeed after placing RC HP filter packet demodulation rate has noticably improved! Thank You much for information!

Just this:5. "Increased the volume" - using some kind of OpAmp circut or just radio volume?

I run an I-Gate (5B4ALR) using WRT54GS-V2, openWRT + APRS4R, TT4 + LCD, and I want to "release" TT4.Ideally a Nano with KISS + LCD, and a DORJI DRA818V all in WRT54GS!

Is it possible for KISS and LCD to coexist?

Thanks in advance,Stelios

]]>http://unsigned.io/forum/profile.php?id=782015-12-19T19:42:27Zhttp://unsigned.io/forum/viewtopic.php?id=119&action=newOk, I will try it again. Maybe this change on LibAPRS and the way I used to by-pass it, caused the problem!Did you change other things on LibAPRS? Do you know if there is a way to use LibAPRS for Kiss?Thanks,Stelios.]]>http://unsigned.io/forum/profile.php?id=782015-10-05T20:42:23Zhttp://unsigned.io/forum/viewtopic.php?id=75&action=newHi everyone-I am looking for a way to decode (and encode for testing purposes) an MSK (FFSK) signal with a handheld device. It is 1200 baud, 1200/1800 Hz continuous phase. I wonder if anyone has tried this with micromodem?

Also, I'm new to the Arduino world, having last dealt with microcontrollers in the 90s. Do I understand correctly that the Micromodem board includes what would be on an Arduino board, plus the additional components needed to perform the modem functions?

Thanks-EricAB1XO

]]>http://unsigned.io/forum/profile.php?id=812015-09-23T13:21:00Zhttp://unsigned.io/forum/viewtopic.php?id=79&action=newHi there!The 3.3v Pro Mini running at 8MHz won't cut it! That's why it's not working. The firmware is currently hardcoded for 16MHz, so the timing of everything will be totally off if you use an 8MHz clock. You can try modifying the firmware yourself, but I am doubting that 8MHz will provide enough clock cycles to make it work.

- Mark

]]>http://unsigned.io/forum/profile.php?id=22015-07-18T09:06:51Zhttp://unsigned.io/forum/viewtopic.php?id=65&action=newHi!Never tried using AGW packet engine before (I don't use windows), but just tried setting it up for the fun of it. Here's the settings I used:

And here's a little test using the agw terminal program (the modem is just loopback connected to itself, so you see my own written message echoed back):

Thank you for taking the time to give a long and detail replies to my questions ... I had to read it a few times before I can actually digest what you wrote there...

]]>http://unsigned.io/forum/profile.php?id=82015-04-29T20:08:29Zhttp://unsigned.io/forum/viewtopic.php?id=48&action=newHi all!I just uploaded some new precompiled images for MicroAPRS with a bugfix for the KISS version of the firmware. Thanks to f1smf for finding and fixing the bug!